To update a product price, first click Products in the main navigation, and identify the product.
Click the product name to open the editor.
Click the retailers tab,
Scroll down to identify the product in need of update. Click the name to to open the Retailer Product Editor.
Update the price as shown
And stock status as needed:
Click Save in the upper right and the price update will be recorded.
Any subsequent updates by a crawler will overwrite any manually updated prices.